Mixer motor unit



Dec. 5, 1939. 1. .n-:PsoN Er AL MIXER MOTOR UNIT 3 sheets-sheet 1 Filed Oct. 5, 1957 www A 5, 1939. l. JEPsoN x-:r AL. y

MIXER MOTOR UNIT Filed 001'.. 6. 1957 3 Sheets-Sheet 2 iii Dec. 5, 1939. l. JEPsoN Er AL MIXER MOTOR UNIT Filed Oct. 6, 1957 5 Sheets-Sheet 3 2 9 10.9 12J s 123 n 1/7 .96 86 39 46 QZ 115 5;/ J8 86 3f .f 0 hg ai 1U" 3 42599 5a 107 if! 93 Patented Dec. 5, 1939` MIXER MOTOR UNIT Ivar Jepson and Paul Chamberlain, Chicago,

Ill.,v assigners pany, Chicago, Ivll.,

to Chicago FlexibleShaft Com a corporation of Illinois Application October 6, 1937, Serial No. 167,543

,4 onimsf (ci. 1v1-zzz) This invention relates to mixers and has special reference to a motor unit thereof of the type hav- A ing a handled casing carrying a motor, control Ameans therefor, and spaced spindles adapted to carry and drive beater elements.

` An object of the invention is the provision of a mixer motor unit having improved governor mechanism including improved space arrangementof the parts within the casing aimed in general at a compact structure, a more eflicient and durable structure, a structure which is eilicient to substantially eliminate radio interference.

We have also aimed to provide a mixer motor structure wherein the several elements thereof including the governor member, the governor brushesfthe switch and the mounting means therefor have improved structuralfeatures which increase the life, decrease the cost, and increase the efficiency of the combination.

Another object of the invention is the provision of a mixer having structure and space arrangement effective to substantially eliminate radio inter'ference.

Other objects and advantages will become apparent from'the following description and the accompanying drawings, in which-'- Figure l is a longitudinal section taken vertically through a mixer unit embodying our invention;

Fig. 2 is a section on the line 2-2 of Figure 1;

Fig. 3 is a fragmentary View of Fig. 2 showing a moved position of the switch;

Fig. 4 is a section substantially on the line 4-4 of Figure 1;

Fig. 5 is a section on the line 5-5 of Fig. 4;

Fig. 6 is a section on the line 6-6 of Figure 1;

Fig. 7 is a section through the governor frame member;

Fig. 8 is a section on the line l-B of Fig. 7, and

Fig. 9 is a wiring diagram of the mixer.

The invention contemplates a mixer unit Aof the type having a casingA 8 provided preferably with some type of handle, such, for example, as indicated at I (Figure l) the casing carrying spaced dependent spindles |2 driven by a worm 3 engaging worm gears |4 on the spindle, the worm being formed on the forward end of a motor armature I5 cooperating with the usual field members I6. The lower side of the casing has a flange Il carrying a pin I8 adapted to support the mixer unit on a pedestal in the manner now common in the art. The casing 9 has a cap I9 at the rear thereof closing the back end and providing a bearing sleeve 2| carrying a bushing 22 to provide lateral bearing support for the armature shaft 23. 'I'he forward-end ofy the armature shaft 23 is carried in a bushing 24. The bearingsleeve 2| is threaded as shown at 24 to a point well beyond the end of the bushing 22 andthe cap I9 is provided with a chamber 25 adapted to hold an oil retaining packing and communicating with the ends of the threads 24, which threads converge and run out on the surface of the sleeve 2|, the packing serving to supply lubricant to the threads which gradually works outward'along the bushing to lubricate the bearing. A plug 26 is positioned in the end of the bearing sleeve 2| and carries a thrust bearing 2l abutting against the end of the armature shaft 23. Positioned on the outer surface of the bearing sleeve 2| is a control knob 28 adapted to be rotated for the purpose of controlling the switch mechanism and the governor, as will presently more fully appear.

Positioned on the armature shaft 23 between the rear bearing and the armature |5 is a centrifugal governor adapted to control the speed of the motor and adjustable through rotation of the control knob 28 to vary the motor speed. This governor includes a governor frame of insulation material best shown in Figs. l, 6, 7 and 8, comprising a disk-like portion 3| and a hub 32, the hub having a metal sleeve 29. Pins 33 and 34 are fixed on the disk 3| and pivotally support levers 35 and 36 forming centrifugally operated make and break mechanism substantially similar to that shown in the copending lapplication of Ivar Jepson, Serial No. 24,700, entitled Motor control mechanism. These levers as described in said application have arms 31 and 38 carrying contacts 39 and 4| adapted to cooperate with stationary contacts 42 and 43. The levers also carry weight members 44 and 45and have springs 46 and 4'| normally urging the contacts into engagement. The weight members 44 and 45 under centrifugal force likewise tend to urge the contacts into engagement. The levers also carry arms 48 and 49 provided With insulating buttons 5| and 52 adapted to limit the rotation of the levers 35 and 36 under the action of the weight members 44 and to permit opening of the contacts as described in said application. Means presently to be described are provided for adjusting the limit of travel of the buttons 5| and 52 and thereby adjust the speed of the governor and motor. While current maybe supplied to both pairs of contacts, in this instance we have supplied current to only one pair of contacts, the second or opposed mechanism being present for the purpose of imparting dynamic balance to the governor. Contact rings 53 and 54 are positioned on the hub 32 and connector members 55 and 56 are l positioned on the face of the disk 3| opposite the levers`35 and 36, the pins 33 and 35 passing through the connector members 55 and 56 and being electricalll connected thereto. The connestor members 55 and 56 extend along the hub 32 as shown at 51 and 58, the portion 51 being electrically connected to the Contact ring 54 and insulated from the contact ring 53 by an insert of insulation material` 59. The portion 58 is insulated from'both of the contact rings by an insulation insert 6I. The contact ring 53 is integral with a metal plate 50 positioned against one face of the disk 3| and is electrically connected to the stationary contacts 42 and 43, whereby when the contacts are closed current iiows through the ring 53, the contacts 42 and 39, theparm 31, the pin 33, the connector member 55 and the ring 54.

A partition or frame member 62 is positioned transversely of the casing 9 to the rear of the governor frame member 29 and is provided with an ear 63 arranged to pivotally 'support an adjusting lever 64, a spring 65 acting between the lever and the partion 62 normally urging the lever in a clockwise direction facing Figure, 1. The lever has spaced fingers 66 and 61 provided with pins 68 and 69 engaging in slots of a comb 1|.

' The collar is rotatably positioned on a sleeve 12 having forwardly extending lingers 13 and 14', each provided with a sloping face as shown at 15. 'I'he lever 64 and collar 1I serve to hold the sleeve 12 so that the buttons 5| and 52 will engage against the sloping faces 15 and thereby limit the travel of the members 35 and 36; By adjustment of the longitudinal position of the sleeve 15, the amount of this travel may be varied whereby the speed of the motor is varied. A pin 16 is positioned in the cap I9 'and projects into a slot 11 of the control knob 28, the slot having a sloping bottom so that by rotation of the control knob 28 the rotative position of the lever 64 may be varied whereby to vary the speed of the motor.

'I'he cap I9 is provided with a plurality of openings 18, and the casing 9 is provided with openings 19 which function to provide a circulation of air through the rear portion of the casing so as to cool the parts, the rotation of the governor serving to causea forced circulation or movement of air through these openings.

A spider or frame member 8| is positioned transversely of the casing between the governor frame member 29 and the armature |5 and has a relatively large central opening 82 for the passage of air. This spider may advantageously b e of relatively thin rigid sheet metal and serves as a frame structure for the support of various electrical elements of the device. Brackets of electrically conductive material 83 and 84 are positioned on the spider 8| on opposite sides of the hub portion 32 as best shown in Fig. 4, and are insulated from the spider by sheets of insulation material 85 and 86 on opposite sides of the spider. The bracket 83 has an upstanding ange 81 provided with an opening 88 for the reception of one end of a brush holder 89 presently to be more fully described. The bracket 83 alsqhas a binding post 9| to which is attached a lead 92 for conducting current to the motor. I'he bracket 83 also has a ange 93 in the form of a relatively long strip of conductive material integral with the bracket through a relatively narrow attaching portion 94 intermediate the ends of the ange to provide free upwardly and downwardly extending end portions 95 and 96. The iiange 93 is likewise provided with an opening 91 for the reception of the brush holder 89. The brush holder 89 is formed by bending a iiat sheet into a tube of rectangular cross-section of such size as to receive a conventional brush 98, one end of the tube being bent inward to provide an end poris positioned in the brush,

tion 99. A spring holder for urging the brush outwardly, and a strip of thin ribbon of electrically conductive material |02 is iixed in the end of the brush as shown at |03 and is soldered or otherwise attached to the end 99 as shown at |04 so as to limit the outward travel of the brush in the holder, and also provide a positive electrical path from the holder to the brush. The brush holder has a shoulder adapted to abut against the bracket 93 so as to limit the travel of the brush holder to the right facing Fig. 5. It will be seen that with this construction the brush holder need simply be slipped into the holes or openings 89 and 91 and no other means of attachment need be provided since the shoulder |05 limits the inward movement, and when assembled contact with the brush 98 against the ring 93 or 94 effectively limits movement in the opposite direction. The brush holder 89 and its supports are so positioned that the brush 98 will bear against the ring 54 to establish electrical connection therewith.

-The bracket 84 has a flange |06 similar to the flange 91 of the bracket 83 carrying a brush holder |01 identical with the brush holder 89. The bracket likewise has a ilange |08 similar to the flange 93 also provided with upwardly and downwardly extending ends, |09 and I||. Positioned on the bracket 84 and extending through the spider 8| is a screw ||2 arranged to carry switch mechanism comprising an outwardly extending pin H3 of metal. Positioned on the pin ||3 for sliding movement thereon is a sleeve I4 having a.,

press iit in a block of insulation I I5 carried on an actuating pin H6 extending through the partition 62 and having bearing support thereon, the pin also extending through a boss ||1 of the cap |9 and into a recess ||8 of the actuating knob 28, the recess being so arranged that in one extreme rotative position of the knob 28 the pin |I6 is forced inward against the tension of a'. spring |I9 to the position shown in Fig. 2. A spring switch lever I2| is attached to the bracket |06 and extends upwardly to a point adjacent the sleeve I|4 and has a contact portion |22 po- -sitioned to be engaged by the insulation block ||5 when the pin I6 is forced inwardly as shown in Fig. 2, and to engage the sleeve I I4 when the pin moves into the slot |I8 to close contact between the bracket 84 and the sleeve ||4. An electric conductor |23 is connected to the screw I|2 which is insulated from the spider 8| and the bracket 84.

'I'he upstanding ends 96 and |09 of the flanges 93 and |08 are provided with openings |24 for the reception of the contact ends |25 and |26 of a resistor |21 of the cartridge type. Likewise the downwardly extending ends 95 and I of the flanges are provided with openings I 28 for the reception of the contact ends |29 and I3| of a condenser |32. A condenser |33 positioned in the forward end of the motor also functions in the electrical circuit.

Attention is directed to the fact that the resistor |21, the condenserl32, and the brush holders 89 and |01 are all carried on the same two brackets. In other words, the bracket 83 supports one end of the resistor and of the condenser and intermediate these points of support carries the brush holder Il. The brackets are likewise carried on the spider Il together with the switch mechanism. This construction accomplishes two important purposes. One of these is to support the resistor and the condenser in as close proximity to the source of radio disturbance as is possible, and the second purpose is to carry these elements in a very condensed space necessitated by the very small space within the casing l. It will be seen that through this arrangement the brushes, the resistor and the condenser |32 are carried in a single plane which includes the hub I2 of the governor. Thus the brush holders I9 and |01 are supported on the same conductor and intermediate the adjacent ends of the resistor and the condenser. This not not only makes for compactness and simplicity, but results in maximum emciency in reducing radio interference occasioned by the brushes and the contact rings. The fact that all of the electrical parts. positioned rearwardly of the motor, aside from the centrifugal contact mechanism per se are carried in the plane of the hub portion, including the resistor |21, the condenser |32, the brushes and the switch mechanism, materially reduces the cost of material and simplifies the assembly operations.

A further advantage of the mixer construction is that the rear bearing is located in the cap I9 permitting of improved bearing construction and improved lubrication thereof as heretofore described.

Attention is also directed to the construction of the centrifugal governor member and the arrangement of the contact rings and other conductors on the governor frame member providing a construction of greater simplicity, lower manufacturing cost and improved eillciency. We have also provided an improved brush construction cooperating with the brush holding brackets and with the rings in a novel and efficient fashion.

While we have thus described and illustrated a specific embodiment of the invention, we are aware that nlnnerous alterations and changes may be made within the spirit of the invention, but we do not wish to be limited except as required by the prior art and the scope of the appended claims.

We claim:

1. The combination in a motor driven household appliance of a motorv having an armature and an armature shaft, centrifugal governor means for the motor comprising a frame member positioned on said shaft adjacent the armature having at least a pair of relatively movable centrifugally operated contacts for controlling the flow of current to the motor, and a cylindrical hub portion provided with at least a pair of spaced contact rings, said contacts and rings being conductively connected, brackets of electrically conductive material on opposed sides of said shaft in the plane of said hub portion, said brackets having resilient supporting flanges provided intermediate their ends with a slot, a resistor conductively supported on and between said flanges at one end thereof, a condenser conductively supported on and between said flanges at the opposite endsthereof, said brackets having a second flange, said second flange having a slot, and brush mechanism for engaging said rings comprising brush holders received in said slots for lateral support and conductive contact, the holders having means for abutting one of said anges to limit movement thereof radially away from the rings, brushes in said holders, and

means acting between the brushes and the holders to urge the brushes against the ringsand the holders into said slots.

2. The combination in a motor driven house- 'hold appliance of a motor having an armature and an amature shaft, centrifugal governor means for the motor comprising a frame member positioned on said shaft adjacent the armature having at least a pair of relatively movable centrifugally operated contacts for controlling the flow of current to the motor, and a cylindrical hub portion provided with at least a pair of spaced contact rings, said contacts and rings being conductively connected, brackets of electrically conductive material on opposed sides of said shaft in the. plane of said hub portion, said brackets having resilient supporting flanges provided intermediate their ends with a slot, a resistor conductively supported on and between said flanges at one end thereof, a condenser conductively supported on and between said flanges at the opposite end thereof, said brackets having a second flange, said second flange having a slot, and brush mechanism for engaging said rings comprising brush holders received in said slots for lateral support and conductive contact, the holders having means for abutting one of said flanges to limit movement thereof radially away from the rings, brushes in said holders, and means acting between the brushes and the holders to urge the brushes against the rings and the holders into said slots, and switch means carried on one of said brackets comprising a pin of conductive material adapted to be connected to a source of power and insulated from said bracket, a spring pressed switch lever on said bracket positioned to engage said pin to 1 close a circuit through said pin and said bracket and a sleeve of insulationmaterial on said pin supported for normal movement on the pin to a position between the pin and lever to open the circuit.

3. The combination in a motor driven household appliance, of a centrifugal governor mechanism comprising a governor frame having a cylindrical hub portion of insulation material, a metal liner therefor for attachment to the motor shaft, an outwardly extending annular fiange of insulation material-intermediate the ends of said hub integral therewith, a metal plate secured against one side of said flange and extending along said hub to provide a contact ring thereon, a metal contact ring spaced from the rst mentioned ring, a recess in said hub extending beneath the iirst mentioned ring, a metal conductor seated in said recess and electrically connected to the second mentioned ring and through said flange, and a stripl of insulation in said recess between said conductors and the rst mentioned ring, at least a pair of relatively movable centrifugally operated contacts on the face of said flange opposite said metal plate electrically connected to the plate and the conductor, and electrically conductive brushes positioned to engage said rings.

4. The combination in a centrifugally operated governor, of a governor frame comprising a cylindrical hub portion of insulation material having slots on the periphery thereof extending longitudinally of the hub portion, an outwardly extending annular ange of insulation material intermediate the ends of said hub and integral therewith, a metal liner for said hub arranged for attachment to a shaft, a metal plate secured across one side of said flange substantially coextensive therewith and extending along said hub adjacent the ange to provide a contact ring thereon, said plate having openings communicatingwith said recesses, a metal contact ring spaced on said hub from the first mentioned ring, metal conductors each having a portion seated in the openings in said metal plate, against said :Gange and in spaced relation to the periphery of said openings for insulation therefrom and having a portion seated in one of said and a strip of insulation in each of said recesses between said conductor and the rst mentioned ring, to insulate the conductor therefrom.

NAR JEPsoN. i PAUL A. cmnmmm. 

